Welt-trimmer



w. J.-M ARTLAND. Welt Trimmer.

(No Model.)

Patented April 12.1881.

I Inn/621750 1 LITNOGRAPflER, WASH NGTON D C UNITED STATES PATENT OFFICE.

WILLIAM J. MARTLAND, OF BROOKTON, MASSACHUSETTS.

WELT-TRIM M ER.

SPECIFICATION formingpart of Letters Patent No. 240,154, dated April 12, 1881.

Application filed January 27, 1881.

To all whom it may concern Be it known that I, WILLIAM J. MAR'ILAND, of Brocktomin the county of Plymouth and State of Massachusetts, have invented certain Improvements in WVelt-Trimmers, of which the following is a specification.

This invention relates to that class of welttrimmers composed of, first, a stock having a lipped guard to bear against the edge of the sole and a shoulder or bearing to move on the bottom of the sole; and, second, a disk-shaped or circular blade attached to the stock by a central screw and adapted to be partially rotated to move its cutting-edge toward the lipped guard as fast as said edge is worn away. In this class of trimmers the lipped guard is always formed at an obtuse angle with the shoulder or hearing for the sole, and the cuttingedge of the blade should be parallel with the surface of the guard that bears against the edge of the sole. Heretofore, to secure the parallelism of the cutting-edge and the surface of the guard, the seat or surface of the stock on which the blade bears has been substantially at right angles with the sole hearing or shoulder, and the blade has been formed with a central seat to bear against this surface, and a marginal bevel on its back side to give its cutting-edge the desired inclination and preserve said inclination, so that it will not be altered by the rotation of the blade to bring forward its cutting-edge as fast as the same is worn away.

My invention has for its object to enable the blade to be made flat and without the marginal bevel above referred to on its back side, thereby reducing its cost and enabling it to be struck by a die from sheet-steel and finished without forging.

To this end my invention consists in the improvements in the form of the blade and of the stock, which I will now proceed to de scribe and claim.

Of the accompanying drawings, forming a part of this specification, Figure 1 represents a view of the front side of a welt-trimmer embodying my invention. Fig. 2 represents an edge view of the same. Fig. 3 represents a section on line a: as, Fig. 1. Fig. 4 represents a section on y :1 Fig. 1. Fig. 5 represents a front view of the stock, the blade being removed. Fig.6 represents a section on line as w,

(No model.)

Fig. 5. Fig. 7 represents a view of the front side of the blade. Fig '7 represents a side viewof the blank from which the blade is formed. Fig. 8 represents an edge view of the blade. Fig. 9 represents a front view of the common form of welt-trimmer. Fig. 10 represents an edge view of the same; and Fig. 11 represents a section on line 2 2, Fig. 9.

The same letters of reference indicate the same parts in all the figures.

In the drawings, a. represents the stock of a welt-trimmer, and 1) represents the blade of the same.

0 represents the lipped guard which bears against the edge of a sole in advance of the blade when the tool is in operation, and d represents the rest or shoulder which bears upon the bottom of the sole. In cross-section the guard 0 stands at an obtuse angle to the shoulder (7, and when the blade b is in operative position the plane of its cutting-edge b is substantially parallel with the cross-sectionof the bearing face or surface of the guard. The construction of the guard and shoulder andthe relative arrangement of the guard, shoulder, and cutting-edge, above described, form no part of my invention, and are the same as have long been employed in welt-trimmers, as

may be seen by reference to Figs. 9, 10, and:

11, which show the form most widely used heretofore. The blade of the trimmers (shown in Figs. 9, 10, and 11) has on its back side a flat central portion, f, and a marginal bevel, g, on which the cutting-edge b is formed, and the stock has a seat or surface, 6, supporting the portion f of the blade, and arranged substantially at right angles with the shoulder 01. In this construction the marginal bevel of the back is necessary to give the cutting-edge b the required inclination and make it parallel with the bearing-surface of the guard c. In carrying out my invention I accomplish the same result by making the back of the blade flat and providing the stock with a flat seat or surface, 0, which is inclined or arranged at an acute angle with the shoulder d, as shown in Fig. 6, the inclination of the seat 6 being such as to give the flat back of the blade on which the cutting-edge b is formed the requisite inclination to make said cutting-edge parallel with the bearing-face of the guard, as shown in Fig. 2, said inclination being unchanged by the rotation of the blade to bring forward its cutting-edge. The blade is preferably made by striking from a sheet of steel a blank having the form of a segment of a flat ring, as shown in Fig. 7, beveling one end of the segment to form the cutting-edge b on the back, and somewhat beveling a portion of the outer edge of the segment to impart a tinish to the blade, as shown in Figs. 7 and 8. This form of blade can be made at small expense and struck out by dies, so that uniformity and interchangeability are secured. The inner edge of the blade forms a recess. 41, through which passes a screw,j, into an orifice in the stock. The blade is pressed against the seat 0 by a clamping-plate, I, through which the screwj passes, the head of the screw pressing the plate l against the blade. The recess t'is preferably larger than the shank of the screw j, so that when the screw is loosened the blade may be moved laterally to some extent, to move the point of its cutting-edge I) up or down, and thereby adjust said point with relation to the nipple or lip of the guard c. It is often desirable to effect such an adjustment of the blade; but when the blade has a hole or orifice in which the attaching-screw fits closely, as in the form shown in Figs. 9, 10, and 11, no such adjustment can be effected.

It will be seen that the opening 41 is formed to permit a lateral movement of the blade in any direction. Hence the blade can be moved to adjust its point relatively to the lip of the tool as well when the blade is much shortened by wear as when it is comparatively new and unworn. This feature of my invention is applicable to blades in which the orifice for the passage of the attaching-screw is entirely sur rounded by the blade, instead of being open on one side, as shown in Fig. 7, and may be used when the screw has an unusually large head to clamp the blade against the stock, such head being an equivalent of thej'ilate l.

m represents an offset or projection on the seat 6 of the stock, said offset being at one side of the orifice for the attaching-screw and of a height equal to the thickness of the blade I). The object of the projection m is to afford a bearing-surface for one end or edge of the plate I when the blade I) has been worn and moved forward until it fails to furnish an adequate support for the plate lat the side of the attaching-screw on which the projection m is located. By the employment of this projection I am enabled to use the blade until but a very small portion of it remains.

Having thus described my invention, what I claim is 1. In a welt-trimmer, the stock having the shoulder or hearing d, the seat e, inclined at an acute angle with said shoulder, and the lipped guard having its face substantially parallel with the seat 0, combined with the flatbacked segmental blade, detachably secured to the stock and bearing upon the seat 6, the inclination of said seat causing the flat back of the cutter to stand at the proper angle to the shoulder d and in a position substantially parallel with the face of the guard, as set forth.

2. The stock having the inclined seat, combined with the segmental blade and the clam ping-plate, attached to the stock by a screw and bearing upon theblade to hold the same against its inclined seat, as set forth.

3. The stock having the inclined seat and the projection or offset formed on said seat, combined with the segmental blade and the clamping-plate, attached to the stock by a screw and bearing upon both the blade and the offset, the latter supporting one end of the clamping-plate when the blade has become worn away, as set forth.

4. The combination of the stock (1, having a flat seat, (2, and a lipped guard, c, the attaching-screw j, having an enlarged head or its specified equivalent, and the segmental flat blade I), having an opening, i, larger than the screw j, and arranged to permit the lateral movement of the blade in any direction when the screw is loosened, for the purpose of adjusting the point of its cutting-edge with relation to the lip of the guard, as set forth.

In testimony whereof I have signed my name to this specification, in the presence of two subscribing witnesses, this 24th day of January, A. D. 1881.

WILLIAM J. MARTL AND.

Witnesses:

WARREN S. GURNEY, OSCAR E. DUNHAM. 

